Pneumatic lifting-jack.



W. BUDESHEIM. PNEUMATIC LIFTING JACK. APPLICATION FILED DBO. 9, 1911.

1,046,145, Patented Dec. 3, 1912.

W/T/VESSES [1V VE/V T OR A llumeyl.

of Brooklyn,

WILLIAM .BUDESHEIM, F BROOKLYN, MARYLAND.

. Application filed December 9', 1911. Serial no. 664,765.

To all whom it may concern:

Be it known that 1, WILLIAM a citizen of the United States, and resident in the county of Anne Arundel and State of Maryland, have invented certain lmprovementsin Pneumatic Lifting- Jacks, of which the following is a specifica- BUDEsHEIM,

. tion.

hereof, and in W I Fig, 1; and Fig. 4 a section and it is particularly This invention relates to a pneumatic lifting jack adapted for a variety of purposes among which is the elevation of the axles of automobiles, when bursted tires are to be removed and new ones substituted therefor; useful where great range of elevation is required, and compactness in bulk when not in use a matter of importance, as will In the further vention which follows, the accompanying drawing hich:-- Figure 1 is a central sectional elevation of the improved jack, and Fig. 2 a section taken on the brokenline a:-w in Fig. 1. Fig. 3 is a'section taken on the broken line y-y in taken onthe reference is made to forming a part broken line 2-2 in Fig. 3.

Referring now to thedrawing, 1 is a cylinder the circumferential wall-a of which is by reference, constructed of a piece of iron tubing, and the upper and lower heads respectively represented by 7) and 0', formed of disks which are grooved to receive the ends of the wall a. Between the wall a and the bottom of the groove in the head a is placed a gasket (1 to produce an air-tight joint; and although a similar gasket is shown in the groove in the head I), it is'n'ot necessary. The heads I) and 0 are held tightly to the wall a by the bolts 6 the heads of which are made pointed to prevent lateral movement of the lower end of the jack when the same air which has served as the means whereby discharged'from the cylinder. Screwed into the piston 2 is thetubular piston rod 5 which extends upward through a suitable boss h on the upper head 7); and in order that. the piston when elevated to a predetermined height will be held thereat independently of Specification of Letters Patent.

hereinafter fully appear. V description of the said in-.

Patented Dec. 3, 1912.

the compressed air by which 'it-has been raised, the said piston rod is circumferentially notched as shown at 7', and the boss it provided with a spring-held pawl 7 adapted to automatically enter the notch. The pawl 7 has a handle whereby itmay be withdrawn from the. notch in the piston rod,

when the piston is to be lowered in the cylinder.

9 is a second piston rod not necessarily t bular, adapted to havea sliding movement iii the hollow rod 5, and to be elevated indep ndently of the same, prior to its application to the axle to be raised, should such extension be required. 7

A simple device to support the inner piston rod within the outer one, and effect a common movement of th two devices when the jack is .in operation,consists of a ring 10 having a bore slightly greater than the diameter of the. inner plston rod, so as to bite the same; and to render the ring reliable for the purpose under all conditions, the end of the-outer piston rod upon which the ring rests, is made angular or inclined with respect to a horizontal line, as shown in Fig. 1.- It will be understood that the ring 10 does not inany manner interfere with the independent elevation of the inner piston rod and should it rise with the same,

it can easily inclined end of the tubular rod, by simply placin it in a horizontal position when it will fa l by gravity. I

12 is a shoe fastened to theu'pper end of the inner piston rod upon which the axle (not shown) of the automobile rests when the jack is in use.

13 is a pipe leading to a source of supply of air under pressure which may consist of an air pump, or a pressed air; and 14 is a cock whereby the the piston has been ra1sed, may-be allowed to escape and admit of the piston falling by its own gravity, or by the weight of'anything resting. on the shoe.

I claim as my invention In a pneumatic lifting jack, the combinatank containing combe made to seat itself upon the v tion of a bottomed cylinder having an inlet and an-outlet for compressed air and a head, a piston in the cylinder,ahollow cylindrical rod which extends from the piston through the head and has an inclined end and a cir curnferential notch, a horizontallymoving spring-held pawl pivoted to thehead, adapted to engage with the notched red, a second ward motion independently of theouter' rod, i I independently sliding rod situated within substantially as specified.

the first and a gravity ring on the inner rod which rbsts'loosely (in the inclined surface WILLIAM H of the outer rod, and when so seated takes 1 Witnesses! an'inclined osition and thereby bites the in- -WM. T. HOWARD,

ner rod an prevents its having any down- JULIA B. R0Bmso 1w. 

